My heater in my car does'nt work, nor the defroster

check the controls for the vent doors.

Vacuum diaphram that works the defrost has gotten a hole in it, or the vacuum hose going to it has come off. Find this diaphram and inspect it! Example of what it looks like is shown.

where 2 find d ac fuse

It can be issue with relay or wiring of the fan causing the problem.
Check the help links.Click the link below:---
A/C, heater, defroster fan, not working? http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html

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Heater AC or defroster fan not working on KIA? http://technoanswers.blogspot.in/2012/02/heater-ac-or-defroster-fan-not-working.html

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Where is A/C CONDENSER FAN MOTOR RELAY Located? http://repairhelpcenter.blogspot.com/2011/11/where-is-ac-condenser-fan-motor-relay.html

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How to Remove Fan Clutch ?

http://technoanswers.blogspot.in/2012/04/how-to-remove-fan-clutch-on-2005-gmc.html

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This will help.
Thanks.

To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.

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Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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No heat on car? http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows intermittently and temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html------------Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
---------Car heater blowing warm, but not hot air? http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html-------- Heater/AC blower motor not working?

http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html

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A/C, heater, defroster fan, not working? http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html Heater problem? http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html---------

This will help.Thanks.

the heater & defroster baffles are controlled by electic motors that open and close the baffle (doors) to let the air to the heater and defroster vents. the motor must be bad

cooling fan or heater fan? if its cooling fan then the coolant temp sensor is bad

check the fuse

Sounds like you need to replace your heater core.

It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.